Charge transfer in core-level shifts at (110) surfaces of compound semiconductors

The charge transfers in compound semiconductors are estimated for the zincblend (110) surface, based on the point-charge model. It is found that the charge transfers at the (110) surface are larger than those in the bulk in contrast to the earlier results. It is, therefore, expected that surface appears to be more ionic than the bulk. The estimated results contain information about the charge distribution and ionicity, which will be helpful to understand the electronic properties at the surface such as the surface binding energy, the surface polarization and surface excitons.